#include<stdio.h>
int main(){
	int grade[10]={1,2,3,4,5,6,7,8,9,7};
	int i;
	int total=0;
	float avg ;
	for(i=0;i<10;i++){
		total+=grade[i];
	}
	avg=((float)total/10); 
	printf("the all students grade ave is:%f\n",avg);	
	return 0;
} 
